一个容量为n的样本,分成若干组,已知某组频数和频率分别为36和0.25,则n=______.
∵频数和频率分别为36和0.25,
∴n=360.25=144.
故答案为:144.
He shows great ______in math.[ ]
A. interest
B. interesting
C. interested
D. be interested
治疗痰在胸膈者当
A.消之B.吐之C.下之D.和之E.汗之